Scenes from the iPhone 4.0 event (photos)

We take you to Apple's headquarters in Cupertino, Calif., where Steve Jobs and company unveiled features in the newest version of the OS, such as multitasking.

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Jobs takes the stage

CUPERTINO, Calif.--Apple CEO Steve Jobs takes the stage at a media event Thursday morning to announce some key features in iPhone OS 4.0, which he says will be released this summer. The upgrades include multitasking, background audio, background location, voice over IP, a new folders feature, and the new iAd mobile advertising platform.

Meanwhile, new models of the iPhone and iPod Touch will be out this summer. And the newly released iPad will get OS 4.0 in the fall.

How multitasking was done

Scott Forstall, senior VP of iPhone Software, takes the stage to explain how multitasking was done. "We looked at the tens of thousands of apps, and distilled down the services that these apps need to work in the background. Then we implemented these services ourselves in a way that preserves performance."

It should be noted, however, that the iPhone 3G and older models of the iPod Touch will not support multitasking.

Cell towers

Location status bar

There's now an indicator on the status bar to let you know if an app is using your location (kind of like the little satellite logo in Android).

Users can also enable or disable location by app in the settings menu. Apple is including a little arrow in the new "location services" menu that will let you know if that particular app has used location within the last 24 hours.

folders example

Create a folder by placing your finger on an app until it jiggles. Then you drag one app on top of another and it instantly makes a folder. The icon changes to show you a small preview of all the apps that are in there.

When you tap on the folder it expands to show you the apps.
"You can have as many folders as you like," Jobs says.

Ad game

Air Jordan

Jobs demos an Air Jordan shoe ad within another app. It has a little horizontal timeline viewer where you can see all the variations of the shoe throughout the years. There's also a Nike ID shoemaking tool right within the ad.